PEDOT改性的正极材料NCA

PEDOT modified cathode material NCA

为了解决铝镍钴酸锂正极材料存在的循环性能不理想、高温循环容量产生气体等等问题,用导电高聚物(PEDOT)对锂离子电池正极材料铝镍钴酸锂表面进行了包覆处理。对处理后的正极材料进行了扫描电子显微镜法(SEM)、X射线衍射光谱法(XRD)、原子吸收光谱法(AAS)和电化学性能测试。研究表明,经导电高聚物包覆处理,提高了NCA粒子的电子导电性,抑制了铝镍钴酸锂NCA正极材料与电解质中有机溶剂与正极材料间的反应。NCA的长期循环性能和高截止电压下的循环稳定性得到有效改善,高温产气问题得到克服。

In order to solve the problems of unsatisfactory cycle life and gas generation at high temperature existing in NCA, conducting polymer PEDOT was coated on the surface of NCA. The modified cathode material was characterized by SEM, XRD, AAS and its electrochemical performance was measured. The test results show that the modified cathode material increase the electron conduction of NCA particles and depress the reaction of the electrolyte with the cathode materials and the continued structure decline of NCA in long term cycling, overcome the gas generation during the charge/discharge process and improve the cycling and high current charging and discharging performance of the tested lithium-ion batteries.